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Mole Concept & Avogadro Number

A polythene b...

Question

A polythene bag of $3$ litre capacity is filled by helium gas (Occupying $11$ at $0.3$ atm & $300$ K) at $300$ K. Subsequently enough $N e$ gas is filled to make total pressure $0.4$ atm at $300$ K. Calculate ratio of moles of $N e$ to $H e$ in container.

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Solution

Mole fraction= $H_{A} = \frac{P_{A}}{P_{A} + P_{B}}$
For $\frac{N e}{H e} = \frac{3}{4}$
$= 0.75$ .

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